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SEER Inquiry System - Report
Produced: 10/27/2025 9:04 AM
Question 20021099
Inquiry Details
References:
Question:
Discussion:
1. AFIP diagnosis: Pancreas, tail, resection: Mucinous cystadenocarcinoma (mucinous cystic neoplasm) of low grade malignant potential. Comment: There are no reliable histomorphologic features which can separate these neoplasms into benign and malignant tumors, and so we consider them all to be low grade malignant tumors.
2. Whipple resection: Intraductal papillary mucinous tumor of the pancreas with extensive low grade and multifocal high grade ductal dysplasia (so-called borderline tumor and carcinoma in-situ).
Answer:
For tumors diagnosed prior to 2007:
Both tumors are reportable to SEER.
1. Code the Histology and Behavior Code fields to 8470/3 [Mucinous cystadenocarcinoma, NOS].
2. Code the Histology and Behavior Code fields to 8453/2 [Intraductal papillary-mucinous carcinoma, non-invasive].
For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.
